Features and advantages: 1) 4-port USB hub: a) Fully compliant with universal serial bus specification version 1.1 and 2.0. b) Single chip integrated USB hub controller with embedded proprietary processor c) Supports four bus-powered/self-powered downstream ports d) Plug and play e) USB 4 ports for varieties of external USB devices connection demand f) Driveless support for Windows XP/2000, Linux 2.4 and Mac OS 8.5 version,Window 98SE supported with USB device driver 2) Stereo speaker: a) USB stereo speaker powered by USB or external power supply b) Inner USB stereo speaker suitable for listening Internet radio or stereo music c) Outer mini microphone built for Internet charting, no need earphone d) Earphone, microphone output connection capability e) Suitable for CD player, MP3 and MP4 3) Mouse pad: a) Black compact panel with smoothly movement which suitable for all kinds of mechanical mouse or optical mouse pad b) Flash blue light or seven colors light around the pad c) Dimension: W248mm x D213mm x H18mm d) Allows matching outside power of DC 5V/2,000mA